[PATCH 0/1] [Artful/linux-oem] Fix i2c touchpad freeze on AMD laptops

[Kai Heng Feng]

Looks like this patch doesn’t get merged to Artful.

> On Nov 29, 2017, at 5:22 PM, Kai-Heng Feng <kai.heng.feng at canonical.com> wrote:
> 
> BugLink: https://bugs.launchpad.net/bugs/1732056

This fix is still needed for all AMD laptops.

> 
> [Impact]
> Touchpad freezes after a brief usage.
> 
> [Fix]
> Quote from the commit log:
> "The stale cached value written at the final stage undoes the masking.
> Fix this by re-reading the register before clearing the interrupt.
> 
> I also spotted that the interrupt-clearing code can race against
> amd_gpio_irq_mask() / amd_gpio_irq_unmask(), so add locking there.
> Presumably this race was leading to the loss of interrupts."
> 
> [Test Case]
> Touchpad no longer freezes on ideapad 320-15ABR, a new Dell Latitude and
> a new Dell Inspiron.
> 
> [Regression Potential]
> Low. It limits to AMD laptops
> 
> Daniel Drake (1):
>  pinctrl/amd: fix masking of GPIO interrupts
> 
> drivers/pinctrl/pinctrl-amd.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
> 
> -- 
> 2.14.1
> 
> 
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